88 lines
2.0 KiB
PHP
88 lines
2.0 KiB
PHP
<?php
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namespace App\Classes\Protocol\DNS;
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use Illuminate\Support\Collection;
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final class Query
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{
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private string $buf;
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private int $class;
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private string $domain;
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private int $id;
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private int $type;
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private Collection $labels;
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// https://github.com/guyinatuxedo/dns-fuzzer/blob/master/dns.md
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private const header = [ // Struct of a DNS query
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'id' => [0x00,'n',1], // ID
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'header' => [0x01,'n',1], // Header
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'qdcount' => [0x02,'n',1], // Entries in the question
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'ancount' => [0x03,'n',1], // Resource Records in the answer
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'nscount' => [0x04,'n',1], // Server Resource Records in the answer
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'arcount' => [0x05,'n',1], // Resource Records in the addition records section
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];
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public function __construct(string $buf) {
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$this->buf = $buf;
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$rx_ptr = 0;
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// DNS Query header
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$header = unpack(self::unpackheader(self::header),$buf);
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$rx_ptr += $this->header_len();
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$this->id = $header['id'];
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$this->qdcount = $header['qdcount'];
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// Get the domain elements
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$this->labels = collect();
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while (($len=ord(substr($this->buf,$rx_ptr++,1))) !== 0x00) {
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$this->labels->push(substr($this->buf,$rx_ptr,$len));
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$rx_ptr += $len;
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}
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// Get the query type/class
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$result = unpack('ntype/nclass',substr($this->buf,$rx_ptr,4));
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$rx_ptr += 4;
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$this->type = $result['type'];
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$this->class = $result['class'];
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$this->domain = substr($this->buf,$x=$this->header_len(),$rx_ptr-$x);
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}
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public function __get($key)
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{
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switch ($key) {
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case 'class':
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case 'domain':
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case 'id':
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case 'labels':
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case 'qdcount':
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case 'type':
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return $this->{$key};
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}
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}
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public static function header_len() {
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return collect(self::header)->sum(function($item) { return $item[2]*2; });
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}
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/**
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* Unpack our configured DNS header
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*
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* @param array $pack
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* @return string
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*/
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protected static function unpackheader(array $pack): string
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{
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return join('/',
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collect($pack)
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->sortBy(function($k,$v) {return $k[0];})
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->transform(function($k,$v) {return $k[1].$v;})
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->values()
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->toArray()
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);
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}
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} |